Answer:
(5h-4t)(5h+4t)
Step-by-step explanation:
25h² - 16t²
adding and subtracting 20ht from it (√25 and √16 = 5x4 = 20):
25h² + 20ht - 20ht -16t²
factor:
(5h-4t)(5h+4t)
We have that
x²<span>-20x
</span><span>Group
terms that contain the same variable
</span>(x²-20x)
Complete
the square
(x²-20x+10²)------> (x-10)²
the answer is
the number must be 100
Answer:
its 1 and 3 like xy = (1,3)
Answer:
3
Step-by-step explanation:
The n th term of an arithmetic sequence is
= a +(n - 1)d
where a is the first term and d the common difference
Given the fifteenth term is - 67, and term 21 is - 97, then
a + 14d = - 67 → (1)
a + 20d = - 97 → (2)
Subtract (1) from (2) term by term
6d = - 30 ( divide both sides by 6 )
d = - 5
Substitute d = - 5 into (1)
a + 14(- 5) = - 67
a - 70 = - 67 ( add 70 to both sides )
a = 3
Thus the first term is 3